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首页> 外文会议>International low impact development conference >Effects of Crumb Rubber Amendments on the Porosity, Water Holding Capacity and Bulk Density of Three Green Roof Substrates
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Effects of Crumb Rubber Amendments on the Porosity, Water Holding Capacity and Bulk Density of Three Green Roof Substrates

机译：橡胶碎料改良剂对三种绿色屋顶基质的孔隙率，持水量和堆积密度的影响

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Extensive green roof systems are becoming increasingly popular with urban Low Impact Design (LID), having a number of tangible benefits, not the least of which is storm water mitigation, ameliorating urban storm water discharge from impervious surfaces while reducing high-flow periods which cause stream-bed erosion and carry pollutants to local waterways. The most important factor of storm water amelioration is the substrate or media, which are mineral-based manufactured aggregates, blended with specific granulometric distributions based on design intent or regional rainfall patterns, better optimizing water holding capacity while still providing enough air-filled porosity for healthy plant roots. Crumb rubber, a recycled tire product, is a potential green roof substrate amendment, and is currently available in large quantities throughout North America. Crumb rubber offers many potential benefits, including improvements in substrate air-filled porosity while reducing the weight of the green roof substrate for increasing the potential retrofit of older buildings. Three typical green roof substrates were amended with 8-12 sieve-mesh crumb rubber in increments of 0, 6, 12, 18, 24, and 30% by volume, and were analyzed for air-filled porosity and water holding capacity with the North Carolina State University Porometer system. Higher proportions of crumb rubber significantly reduced total porosity and water holding capacity, yet increased air-filled porosity compared to unamended control in one substrate and decreased bulk density in all substrates. This study was developed to determine the effect of crumb rubber amendments on the porosity and bulk density of green roof substrates to balance water holding performance yet, retain a root friendly environment, and increase the potential for green roof retrofit onto buildings with limited structural capacity.
机译：广泛的绿色屋顶系统越来越受到城市低冲击设计（盖子），具有许多有形益处，并非最少的是暴风水缓解，改善了城市雨水从不透水表面放电，同时减少了导致的高流量期流床侵蚀并将污染物带到当地水道。雨水改良的最重要因素是基材或介质，其是基于矿物的制造的聚集体，与基于设计意图或区域降雨模式的特定粒度分布混合，更好地优化水持有能力，同时仍提供足够的充气孔隙率健康的植物根源。 Crumb橡胶是一种回收的轮胎产品，是潜在的绿色屋顶基板修正，目前在北美的大量方面可用。 Crumb橡胶提供了许多潜在的好处，包括基板充气孔隙度的改善，同时减少了绿色屋顶基板的重量，以增加旧建筑的潜在改装。用8-12个筛网碎屑橡胶以0,6,12,18,24和30重量％的增量进行修复三个典型的绿色屋顶基材，分析了充气孔隙率和北方的水持续容量卡罗莱纳州立大学光伏仪系统。较高比例的面包屑橡胶显着降低了总孔隙率和水持能力，而在一个基材中的未加工控制和所有基材中的堆积密度降低了增加的充气孔隙率。开发了这项研究以确定面包屑橡胶修正对绿色屋顶基板的孔隙率和散装密度的影响，以平衡水保持性能，保留根友好环境，并增加结构容量有限的建筑物上的绿色屋顶改造的潜力。

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